added new functions in UserDAO
changes
add new user
get user by ID
update user data
delete user
get user
AdministratorResource created
Changes on User model
Administrator component statistics
return id for new user
Changes on AdministratorResource
Merge branch 'admin' of https://github.com/Ico91/Articles into admin
Removed statistics bugs
Merge branch 'admin' of ssh://github.com/Ico91/Articles into admin
return id for new user
Merge branch 'admin' of http://github.com/Ico91/Articles into admin
Merge branch 'admin' of https://github.com/Ico91/Articles into admin
administrator filter
Merge branch 'admin' of https://github.com/Ico91/Articles into admin